Good day,
Thanks for the reply.
I recently bought this album on the Russian collapse in St. Petersburg. The seller is no "history" did not know.
Almost all leaves are labeled with letters. Mark looks like a pencil.
Meet the following options : "B", "M", "P","RIN","MA","C", "H", "L".
I.e. it is possible to assume that this "signal" is an instance or something like that.
Sincerely,
Vladimir
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